Calm window manager (mainly known for its shorthand name cwm) is a member of a once-powerful and now-declining family of minimalist X11 window managers. It is relatively unknown outside the OpenBSD community, but it deserves more notice.

forcing the user to learn all the invocations she needs to get stuff done. It's slower

It may take longer to learn, but can often be much faster to use in practice. Plus, cwm gives visual feedback by narrowing your choices to those selected by your search input. So this does not equate with a return to the command line where your argument is more applicable.